Live GMAT classes with Target Test Prep start Nov 21 and Nov 22. First class free.

See classes
Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

Newsweek Readers’ Choice Awards 2026 winner: Target Test Prep, #1 Test Prep

Target Test Prep was voted #1 Best Test Prep in the 2026 Newsweek Readers’ Choice™ Awards.

★★★★★5.0563 reviews
GMATLiveTeachStarts Nov 22
Josh Braslow, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Josh Braslow, 20+ years in test prep

Nov 22 · Josh Braslow
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes + 6 months of TTP OnDemand
  • Attend the first class for free
  • Every class is recorded, so you never fall behind
View classes & enroll
Limited seats availableTarget Test Prep
EALiveTeachOnDemandStart anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

EXECUTIVE ASSESSMENT

with

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll Start free 5-day trial
Limited cohort · enrollment openTrial includes full course accessTarget Test Prep
GMATOnDemandStart anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions
Start free 5-day trial
Read 563 reviewsTarget Test Prep

A total of 9,180 people participated in a research study on the genetics of eye color. Of the participants, 4/9 had two

Expert replies
Post new topic Post Reply
Subscribe topic
Previous Topic Next Topic
Moderator
Posts: 2650
Joined: Sun Oct 15, 2017 1:50 pmFollowed by: 6 members
by BTGmoderatorLU » Fri Feb 26, 2021 4:51 pm
Timer
00:00
Your answer
Difficulty–

right wrong

Pick an answer to see how members did

Source: Manhattan Prep

A total of 9,180 people participated in a research study on the genetics of eye color. Of the participants, 4/9 had two parents with blue eyes, and of the remaining participants, 8/17 had one parent with blue eyes. How many participants, in total, had at least one blue-eyed parent?

A. 780
B. 2,700
C. 4,320
D. 6,480
E. 8,400

The OA is D
Top
Join the discussion
Source: — Problem Solving |
Legendary Member
Posts: 2214
Joined: Fri Mar 02, 2018 2:22 pmFollowed by: 5 members

Re: A total of 9,180 people participated in a research study on the genetics of eye color. Of the participants, 4/9 had

by deloitte247 » Fri Mar 05, 2021 1:14 am
Total participant = 9180
Of the total participants, 4/9 had two parent2 with blue eyes
$$\frac{4}{9}\cdot9180=4080$$
remaining participants = 9180 - 4080 = 5100
Of the remaining participants, 8/17 had one parent with blue eyes
$$\frac{8}{17}\cdot5100=2400$$
Participant with two blue-eyed parent and one blue-eyed parent had at least one blue-eyed parent; so their total = 4080 + 2400
= 6480
Answer = option D
Top
Join the discussion

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 8246
Joined: Sat Apr 25, 2015 10:56 amFollowed by: 29 members
Location: Los Angeles, CA
Thanked: 43 times

Re: A total of 9,180 people participated in a research study on the genetics of eye color. Of the participants, 4/9 had

by Scott@TargetTestPrep » Sat Mar 13, 2021 3:08 pm
BTGmoderatorLU wrote: ↑
Fri Feb 26, 2021 4:51 pm
 Source: Manhattan Prep

A total of 9,180 people participated in a research study on the genetics of eye color. Of the participants, 4/9 had two parents with blue eyes, and of the remaining participants, 8/17 had one parent with blue eyes. How many participants, in total, had at least one blue-eyed parent?

A. 780
B. 2,700
C. 4,320
D. 6,480
E. 8,400

The OA is D
Solution:

The fraction of participants who had at least one blue-eye parent is:

4/9 + (1 - 4/9) x 8/17 = 4/9 + 5/9 x 8/17 = 68/153 + 40/153 = 108/153

Since there are a total of 9,180 participants, 9,180 x 108/153 = 60 x 108 = 6,480 participants had at least one blue-eye parent.

Answer: D

Scott Woodbury-Stewart
Founder and CEO
[email protected]

Image

See why Target Test Prep is rated 5 out of 5 stars on BEAT the GMAT. Read our reviews

ImageImage
Top
Join the discussion